Re: Advice on hardware server to use for small a dedicated data center

From	Miles Fidelman <mfidelman@meetinghouse.net>
Newsgroups	linux.debian.user
Subject	Re: Advice on hardware server to use for small a dedicated data center
Date	2020-07-01 14:20 +0200
Message-ID	<AnJSx-8m9-1@gated-at.bofh.it> (permalink)
References	(6 earlier) <AnbnP-2pn-3@gated-at.bofh.it> <AnsRH-5g7-1@gated-at.bofh.it> <AntE5-5vS-1@gated-at.bofh.it> <AnItt-79t-23@gated-at.bofh.it> <AnIMN-7AE-1@gated-at.bofh.it>
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On 7/1/20 7:04 AM, Reco wrote:

> On Wed, Jul 01, 2020 at 08:49:09PM +1000, elvis wrote:
>> On 1/7/20 4:51 am, Dan Ritter wrote:
>>> Miles Fidelman wrote:
>>>> On 6/29/20 7:20 PM, Dan Ritter wrote:
>>>>
>>>>> Miles Fidelman wrote:
>>>>>> On 6/29/20 9:10 AM, Dan Ritter wrote:
>>>>>>
>>>>>>> Miles Fidelman wrote:
>>>>>> Now who's being pedantic?
>>>>> Precisely.
>>>>>
>>>>>> And isn't this exactly what I said??? mdadm is an admin program, it doesn't
>>>>>> perform the raid function.
>>>>> And it's OK to refer to the whole thing as an mdadm RAID.
>>>> No.. if you want to be pedantic, the proper terminology is "Linux Raid" or
>>>> "md RAID."?? mdadm is one of several admin programs available
>>> What are the others, please? (That will work on a modern system,
>>> say, Debian stable or oldstable or unstable.)
>>>
>>> I think there's precisely one -- libblockdev2.
>> lvm does its own raid now too...
>>
>> https://www.reddit.com/r/linuxquestions/comments/9kkk3b/md_raid_lvm_vs_lvm_raid/
> ... and it's not the mdraid, but entirely different kernel subsystem.
> Last time I've checked it, they did not even implemented incremental
> RAID assembly in LVM, meaning that you won't be able to use such array
> if a single drive from LVM-based RAID will fail.
> They've solved this problem in mdraid like 15 years ago.
>
>
> But staying on-topic, I'm too very interested to hear about alternative
> interfaces to mdraid, which do not involve mdadm. libblockdev2 does not
> count, it's merely a wrapper.

Sure looks like LVM raid make use of the same underlying md raid 
software as administered mdadm.

Which kind of just reiterates what I said earlier - mdadm, as an 
administrative interface, is distinct & separate from the various 
software components that create md raid devices.  In the past, there 
were several other admin programs, but mdadm seems to be the major, 
maintained tool.

The info that LVM now includes some direct raid setup tools (that also 
make use of the underlying mdraid system), is new, and possibly useful.

Which does raise an interesting question:  When the Debian installer 
gives the option to set up RAID volumes, does it use mdadm, or do it's 
own config, or use common libraries?  (Kind of arcane, but inquiring 
minds want to know.)

Miles Fidelman


-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

Theory is when you know everything but nothing works.
Practice is when everything works but no one knows why.
In our lab, theory and practice are combined:
nothing works and no one knows why.  ... unknown

Thread

Advice on hardware server to use for small a dedicated data center echo test <echotest09@gmail.com> - 2020-06-26 20:40 +0200
  Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-26 21:50 +0200
    Re: Advice on hardware server to use for small a dedicated data center Nicholas Geovanis <nickgeovanis@gmail.com> - 2020-06-26 22:10 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-28 22:50 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Leslie Rhorer <lesrhorer@att.net> - 2020-06-29 08:10 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-30 00:00 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-29 15:20 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-29 23:50 +0200
          Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-30 01:30 +0200
            Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-30 20:10 +0200
              Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-30 21:00 +0200
                Re: Advice on hardware server to use for small a dedicated data  center elvis <elvis@dogonfire.com> - 2020-07-01 12:50 +0200
                Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-07-01 13:10 +0200
                Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-07-01 14:20 +0200
                RAID stuff [was Re: Advice on hardware server to use for small a  dedicated data center] Miles Fidelman <mfidelman@meetinghouse.net> - 2020-07-01 14:30 +0200
                Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-07-01 14:50 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-29 15:00 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 17:00 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-29 17:10 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 17:40 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-29 17:30 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-29 18:00 +0200
          Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 18:20 +0200
            Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-29 18:30 +0200
              Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 22:50 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 18:00 +0200
  Re: Advice on hardware server to use for small a dedicated data center deloptes <deloptes@gmail.com> - 2020-06-26 22:00 +0200
  Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-26 22:10 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-26 22:50 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-26 23:00 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Richard Hector <richard@walnut.gen.nz> - 2020-06-29 15:30 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-29 15:50 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 17:30 +0200
          Re: Advice on hardware server to use for small a dedicated data  center Reco <recoverym4n@enotuniq.net> - 2020-06-29 17:40 +0200
            Re: Advice on hardware server to use for small a dedicated data  center MAS Jean-Louis <jean-louis.mas@imag.fr> - 2020-06-29 18:40 +0200
              Re: Advice on hardware server to use for small a dedicated data  center Celejar <celejar@gmail.com> - 2020-06-29 19:10 +0200
  Re: Advice on hardware server to use for small a dedicated data center ghe2001 <ghe2001@protonmail.com> - 2020-06-26 22:20 +0200
  Re: Advice on hardware server to use for small a dedicated data  center Leslie Rhorer <lesrhorer@att.net> - 2020-06-27 09:40 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-27 22:10 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Dan Ritter <dsr@randomstring.org> - 2020-06-28 01:10 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Fred <fred@blakemfg.com> - 2020-06-28 02:10 +0200
        Re: Advice on hardware server to use for small a dedicated data center Kenneth Parker <sea7kenp@gmail.com> - 2020-06-28 06:00 +0200
          Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-28 06:10 +0200
  Re: Advice on hardware server to use for small a dedicated data  center Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-27 11:10 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-27 11:20 +0200
  Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-28 09:20 +0200
    Re: Advice on hardware server to use for small a dedicated data center deloptes <deloptes@gmail.com> - 2020-06-28 09:50 +0200
    Advice on hardware server to use for small a dedicated data center echo test <echotest09@gmail.com> - 2020-06-28 12:40 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-28 21:00 +0200
        Advice on hardware server to use for small a dedicated data center echo test <echotest09@gmail.com> - 2020-06-29 19:50 +0200
          Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-30 00:30 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-29 09:10 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Miles Fidelman <mfidelman@meetinghouse.net> - 2020-06-28 20:30 +0200
      Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-29 04:20 +0200
        Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-29 04:30 +0200
    Re: Advice on hardware server to use for small a dedicated data  center Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-29 09:10 +0200
      Re: Advice on hardware server to use for small a dedicated data  center Alessandro Baggi <alessandro.baggi@gmail.com> - 2020-06-29 09:30 +0200
        Re: Advice on hardware server to use for small a dedicated data  center Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-29 21:00 +0200
      Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-29 09:40 +0200
    Re: Advice on hardware server to use for small a dedicated data  center David Christensen <dpchrist@holgerdanske.com> - 2020-06-29 22:10 +0200

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